Resin plate

Abstract

A resin plate comprising a first and at least one second layers is provided. The first layer comprises a resin having 75% by weight or larger of styrene-based unit on the basis of resin (A), and the second layer comprises an ultraviolet absorber and a resin having 50% by weight or larger of styrene-based unit on the basis of resin (B), in which the ultraviolet absorber is contained in the second layer in the amount of 0.1 to 3 parts by weight per 100 parts by weight of the resin in the second layer and is spread at 0.2 to 2 g per square meter of the second layer. The resin plate has little deformation due to moisture absorption and high durability, is even if the amount of ultraviolet absorber contained is relatively small.

1 . A resin plate comprising a first layer and at least one second layer placed on at least one side of the first layer, 
 wherein the first layer comprises a resin having 75% by weight or larger of styrene-based unit on the basis of the resin in the first layer, and    the second layer comprises an ultraviolet absorber and a resin having 50% by weight or larger of styrene-based unit on the basis of the resin in the second layer in which the ultraviolet absorber is contained in the second layer in the amount of 0.1 to 3 parts by weight per 100 parts by weight of the resin in the second layer and is spread at 0.2 to 2 g per square meter of the second layer.    
   
   
       2 . The resin plate according to  claim 1 , wherein the resin in the first layer further has methacrylate unit in the amount of 25% by weight or smaller on the basis of the resin in the first layer.  
   
   
       3 . The resin plate according to  claim 1 , wherein the resin for the second layer further has methyl methacrylate unit in the amount of 50% by weight or smaller on the basis of the resin in the second layer.  
   
   
       4 . The resin plate according to  claim 1 , wherein the ultraviolet absorber is an ultraviolet absorber having a relative maximum absorption peak at a wavelength in the range of from about 250 nm to about 320 nm.  
   
   
       5 . The resin plate according to  claim 4 , wherein the ultraviolet absorber is an ultraviolet absorber having the relative maximum absorption peak in the wavelength range of from about 250 nm to about 320 nm as the most largest absorption peak in the wavelength range of from about 250 nm to about 800 nm.  
   
   
       6 . The resin plate according to  claim 1 , wherein the first layer further comprises a light-diffusing agent in the amount of from 0.1 to 10 parts by weight per 100 parts by weight of the resin in the first layer.  
   
   
       7 . The resin plate according to  claim 1 , wherein the at least one second layer further comprises a surfactant in the amount of from 0.1 to 5 parts by weight per 100 parts by weight of the resin in the at least one second layer.  
   
   
       8 . The resin plate according to  claim 1 , wherein the is resin plate has fine irregularities on at least one surface of the plate.